Why is there an unusual behaviour of water? Its maximum density is at 4 degree Celsius. Water doesn't always expand unlike other liquids and contract when it is cooled. This is from the topic "Expansion of Liquids"

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Why is there an unusual behaviour of water? Its maximum density is at 4 degree Celsius. Water doesn't always expand unlike other liquids and contract when it is cooled. This is from the topic "Expansion of Liquids"

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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a lot of water's unusual behaviour/properties are based in its polarity and hydrogen bonding so the usual explanation is that, as energy is taken from water, its molecules can settle into regular hexagonal patterns. if it is re-heated, the kinetic energy of the H2O molecules disrupts this so whilst there is still that liquid stickiness between molecules, it is less well defined and the molecules are more compacted.
https://www.youtube.com/watch?v=UukRgqzk-KE
Nice video @bozhena

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